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Two more free tools to add to the list
http://sourceforge.net/projects/wnrtool/
http://www.tools4ever.com/products/free/freeping/
A ISP I use to work for used a program called whatsup. A little too expensive in my opinion but it can monitor everything under the sun and page the network admin when something fails. Also generates lots of graphs and charts for management.
http://www.ipswitch.com/products/whatsup/
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Simple one line batch file.
FOR /F "tokens=1 delims=," %%a in (c:\temp\myiplist.txt) do ping -n 1 %%a >> c:\temp\pinganswers.txt
